CN107489434B - Method for detecting leakage of underwater waterstop after immersed tunnel installation - Google Patents
Method for detecting leakage of underwater waterstop after immersed tunnel installation Download PDFInfo
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- CN107489434B CN107489434B CN201710776330.3A CN201710776330A CN107489434B CN 107489434 B CN107489434 B CN 107489434B CN 201710776330 A CN201710776330 A CN 201710776330A CN 107489434 B CN107489434 B CN 107489434B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000009434 installation Methods 0.000 title description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 204
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 230000008859 change Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000001514 detection method Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/001—Survey of boreholes or wells for underwater installation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
The invention discloses a method for detecting leakage of an underwater water stop belt after an immersed tube tunnel is installed, which comprises the following steps: 1) the inner wall of the immersed tube is provided with a water inlet hole and an exhaust hole which are communicated with the closed cavity at the joint; 2) injecting water and exhausting the closed cavity, closing the exhaust hole after the gas is exhausted, and continuing injecting water until the water pressure reaches the design requirement, and stopping injecting water; 3) continuously monitoring whether the water pressure in the closed cavity drops within a period of time, and checking the condition of the water stop belt; 4) if the water pressure in the closed cavity is gradually reduced, searching a leakage point and repeating the steps 2 and 3 after treatment until the water pressure is kept unchanged; 5) and discharging all water in the closed cavity. The method can check the waterproof effect of the water stop at the joint after the open sea immersed tube is installed, ensures that the water tightness of the tube joint is good, avoids the loss caused by the water leakage of the immersed tube joint, and has very important guiding significance for the engineering design and construction of similar immersed tube tunnels.
Description
Technical Field
The invention relates to the technical field of immersed tube tunnels, in particular to a method for detecting leakage of an underwater water stop after an immersed tube tunnel is installed.
Background
In recent years, as the number of cross-sea tunnel projects is increasing, the submarine tunnel built by the immersed tube method is more and more applied. The immersed tube tunnel is generally that a plurality of factory prefabricated standard tube sections are transported to a sea surface site in a floating mode, and the tube sections are butt-jointed and sunk in a dredged foundation trench on the seabed.
A certain submarine immersed tube tunnel is provided with a plurality of standard tube joints, two production line prefabricated tube joints are arranged, each standard tube joint is 180 meters long, 37.95 meters wide and 11.4 meters high and comprises 8 sections of 22.5 meters, a GINA water stop and a large OMEGA water stop two-way waterproof system are arranged between the adjacent tube joints, the GINA water stop is arranged between the end faces of the adjacent tube joints, the large OMEGA water stop is provided with a tube joint inner cavity, the GINA water stop is compressed in a hydraulic compression joint mode to form first waterproof when the tube joints are immersed and butted to form a large OMEGA water stop, the large OMEGA water stop is arranged in the tube joint inner cavity after the tube joints are immersed and installed to form second waterproof, and finally an annular closed cavity is formed between the GINA water stop and the large OMEGA water stop.
In order to avoid the destructive damage to the open sea immersed tube after the immersed tube waterproof system is in problem, it is necessary to check the water stop at the joint of the pipe joint after the immersed tube is installed, so as to ensure that the waterproof system has no water seepage and meets the waterproof requirement.
Disclosure of Invention
The invention aims to: the underwater water stop method for the immersed tube tunnel after installation can be used for detecting the waterproof effect of the water stop at the joint after leakage detection of the immersed tube, so that the water stop joint is ensured to have good water tightness, the loss caused by water leakage of the immersed tube joint is avoided, and the method has very important guiding significance for engineering design and construction of similar immersed tube tunnels.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for detecting leakage of an underwater waterstop after an immersed tunnel is installed comprises the following steps:
a. a water inlet hole and an exhaust hole are formed in the inner wall of the immersed tube, and the water inlet hole and the exhaust hole are communicated with a closed cavity formed between the GINA water stop and the large OMEGA water stop after the immersed tube is installed;
b. respectively injecting water and exhausting gas into the closed cavity through the water inlet hole and the exhaust hole, closing the exhaust hole after the gas is exhausted, and continuing injecting water until the water pressure reaches the design requirement, and stopping injecting water;
c. continuously monitoring whether the water pressure in the closed cavity drops within a period of time, and checking the condition of the water stop belt;
d. if the water pressure in the closed cavity is gradually reduced, searching a leakage point and repeating the steps b and c after treatment until the water pressure is kept unchanged;
e. and discharging all water in the closed cavity.
According to the invention, the water inlet hole and the exhaust hole are arranged on the inner wall of the immersed tube, water is injected into the closed cavity formed between the GINA water stop and the large OMEGA water stop after the immersed tube is installed, the air is exhausted, the water in the closed cavity is kept at a certain pressure, and whether the water pressure in the closed cavity is reduced or not is continuously monitored, so that whether water leakage exists in the two waterproof systems of the GINA water stop and the large OMEGA water stop at the immersed tube joint or not is known, and then the water leakage point is treated and repeatedly tested until the water pressure is kept unchanged.
As a preferable scheme of the present invention, in step a, the water inlet hole and the air outlet hole are pipes embedded in the immersed tube when the immersed tube is prefabricated. Through burying the pipeline underground when prefabricating the immersed tube as water injection and exhaust passage when hunting leak to avoid driling or other processings to the immersed tube after the immersed tube installation, reduce the relevant work load of hunting leak in-process, be favorable to promoting the leak hunting efficiency of construction.
As a preferable scheme of the invention, the exhaust hole is arranged on the top plate of the inner cavity of the immersed tube. Because the closed cavity is an annular cavity in the vertical direction, the exhaust holes are arranged on the top plate of the inner cavity of the immersed tube, namely the exhaust holes are arranged at the higher position of the closed cavity, and the exhaust holes are beneficial to exhausting gas out of the closed cavity.
As the preferable scheme of the invention, the water inlet hole is arranged on the bottom plate of the inner cavity of the immersed tube. Because the closed cavity is an annular cavity in the vertical direction, the water inlet hole is arranged on the bottom plate of the inner cavity of the immersed tube, namely the water inlet hole is arranged at the lower position of the closed cavity, so that the water level in the closed cavity gradually rises from low to high, and gas in the cavity can be better discharged.
As a preferable scheme of the invention, the number of the water inlet holes is two. Through designing two inlet openings, one is used for standby, prevents that the inlet opening from being blockked up and can not implement waterstop leak hunting work.
As a preferable scheme of the invention, the protective cover for protecting the water inlet hole is arranged on the bottom plate of the inner cavity of the immersed tube, so that the problem that the water inlet hole is damaged by external force before the water stop is subjected to leak detection to influence the implementation of leak detection work can be avoided.
In the step b, when water is injected into the closed cavity and air is exhausted, a water receiving container needs to be arranged at the air exhaust hole to receive water flowing out of the air exhaust hole, so that the detection position is prevented from being wetted.
In a preferred embodiment of the present invention, when water is injected into the closed cavity and air is exhausted, the air outlet may be closed when water is discharged from the air outlet and the water is a continuous water column.
In the preferred embodiment of the present invention, in step b, the water injection pressure in the closed cavity is the ambient water pressure outside the pipe joint. Through setting up the water injection pressure in the airtight cavity into tube coupling joint external environment water pressure, can simulate like this when the GINA waterstop became invalid, the water pressure in the airtight cavity is unanimous with external environment water pressure promptly to the waterproof performance of big OMEGA waterstop is tested.
In step c, it is necessary to continuously monitor the change of the water pressure in the closed cavity for four hours.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the water inlet and the air outlet are arranged on the inner wall of the immersed tube, water is injected into a closed cavity formed between the GINA water stop and the large OMEGA water stop after the immersed tube is installed, air is exhausted, water in the closed cavity is kept at a certain pressure, and whether the water pressure in the closed cavity is reduced or not is continuously monitored, so that whether water leakage exists in the two waterproof systems of the GINA water stop and the large OMEGA water stop at the joint of the immersed tube or not is known, and then the leakage point is treated and repeatedly tested until the water pressure is kept unchanged;
2. the pipeline is buried as a water injection and exhaust channel during leak detection when the immersed tube is prefabricated, so that the immersed tube is prevented from being drilled or otherwise treated after being installed, the related workload in the leak detection process is reduced, and the leak detection construction efficiency is improved;
3. through setting up the water injection pressure in the airtight cavity into tube coupling joint external environment water pressure, can simulate like this when the GINA waterstop became invalid, the water pressure in the airtight cavity is unanimous with external environment water pressure promptly to the waterproof performance of big OMEGA waterstop is tested.
Description of the drawings:
fig. 1 is a schematic diagram of the distribution of water inlet holes and exhaust holes on the section of a immersed tube joint.
Fig. 2 is a partial sectional view of the water inlet hole of fig. 1.
Fig. 3 is a partial sectional view of the exhaust hole of fig. 1.
Fig. 4 is a flow chart of the method for detecting the leakage of the underwater water stop after the immersed tube tunnel is installed.
The labels in the figure are: 1-water inlet, 2-exhaust hole, 3-pipeline, 31-valve, 32-nut, 4-protective cover, 41-expansion bolt, 5-pipe joint I, 6-pipe joint II, 7-GINA water stop, 8-large OMEGA water stop and 9-closed cavity.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Examples
The embodiment provides a method for detecting the leakage of an underwater water stop belt after an immersed tube tunnel is installed;
as shown in fig. 1 to 4, the method for detecting a leak of an underwater water stop after an immersed tube tunnel is installed in the embodiment includes the following steps:
a. the inner walls of the immersed tube joint I5 and the immersed tube joint II 6 are provided with a water inlet hole 1 and an exhaust hole 2, and the water inlet hole 1 and the exhaust hole 2 are communicated with a closed cavity 9 formed between a GINA water stop 7 and a large OMEGA water stop 8 after the immersed tube is installed;
b. starting a water pressurizing device to respectively inject water and exhaust the closed cavity 9 through the water inlet hole 1 and the exhaust hole 2, closing the exhaust hole 2 after the gas is exhausted, and continuing injecting water until the water pressure reaches the design requirement and stopping injecting water;
c. continuously monitoring whether the water pressure in the closed cavity 9 drops within a period of time, and checking the condition of the water stop belt;
d. if the water pressure in the closed cavity 9 is gradually reduced, indicating that leakage exists, searching a leakage point and repeating the steps b and c after treatment until the water pressure is kept unchanged;
e. when the water pressure in the closed cavity 9 is kept unchanged all the time, which indicates that the water stop has good water tightness, the water pressing device can be started to enter a water return program, and the exhaust hole 2 at the top of the immersed tube is opened until all the water in the cavity is discharged.
In this embodiment, in step a, the water inlet hole 1 and the exhaust hole 2 are the pipeline 3 embedded in the immersed tube joint when the immersed tube is prefabricated, the tail end of the pipeline is communicated with the closed cavity 9, the valve 31 and the nut 32 are arranged at the inlet of the pipeline, and the nut is mainly and conveniently used for connecting an external water pipe. Through burying the pipeline underground when prefabricating the immersed tube as water injection and exhaust passage when hunting leak to avoid driling or other processings to the immersed tube after the immersed tube installation, reduce the relevant work load of hunting leak in-process, be favorable to promoting the leak hunting efficiency of construction.
In this embodiment, the exhaust hole 2 is arranged on the top plate of the inner cavity of the immersed tube. Because the closed cavity is an annular cavity in the vertical direction, the exhaust holes are arranged on the top plate of the inner cavity of the immersed tube, namely the exhaust holes are arranged at the higher position of the closed cavity, and the exhaust holes are beneficial to exhausting gas out of the closed cavity.
In this embodiment, the water inlet 1 is arranged on the bottom plate of the inner cavity of the immersed tube. Because the closed cavity is an annular cavity in the vertical direction, the water inlet hole is arranged on the bottom plate of the inner cavity of the immersed tube, namely the water inlet hole is arranged at the lower position of the closed cavity, so that the water level in the closed cavity gradually rises from low to high, and gas in the cavity can be better discharged.
In this embodiment, the number of inlet openings 1 is two, and only one of them needs to be used during the water injection, and another one closes the valve. Through designing two inlet openings, one is used for standby, prevents that the inlet opening from being blockked up and can not implement waterstop leak hunting work.
In this embodiment, be equipped with the safety cover 4 that is used for protecting inlet opening 1 on immersed tube inner chamber bottom plate, this safety cover is sleeve structure, can directly cover in the inlet opening entry top, and the sleeve below is equipped with circular fixed disk, then is fixed with immersed tube inner chamber bottom plate through four expansion bolts 41, and this safety cover can avoid before the waterstop leak hunting, and the inlet opening receives external force and destroys, influences the implementation of leak hunting work.
In this embodiment, in step b, when water is injected into the closed cavity 9 for air exhaust, a water receiving container needs to be disposed at the exhaust hole 2 to receive water flowing out of the exhaust hole, so as to avoid wetting the detection position, and facilitate subsequent observation of the water leakage position.
In this embodiment, when water is injected into the sealed cavity 9 and air is exhausted, when the water discharged from the air outlet 2 is a continuous water column, the air in the cavity is exhausted, and the air outlet can be closed.
In this embodiment, in the step b, the water injection pressure in the closed cavity 9 is the external ambient water pressure of the pipe joint. Through setting up the water injection pressure in the airtight cavity into tube coupling joint external environment water pressure, can simulate like this when the GINA waterstop became invalid, the water pressure in the airtight cavity is unanimous with external environment water pressure promptly to the waterproof performance of big OMEGA waterstop is tested.
In this embodiment, in step c, after the water pressure in the sealed cavity 9 meets the requirement, the change of the water pressure in the sealed cavity needs to be continuously monitored for four hours, and the water-stop belt is checked to have no abnormal condition.
Specifically, an exhaust hole valve is opened firstly, water is injected from an inlet of a water inlet hole 1 of a bottom plate of an inner cavity of the immersed tube to enter a closed cavity 9, air in the closed cavity is exhausted from an exhaust hole 2 at the top of the immersed tube, the exhaust hole is closed after all the air is exhausted, the water is injected continuously until the water pressure in the closed cavity reaches a design value, the water inlet valve is closed, the pressure in the closed cavity is maintained for four hours, and if the water stop belt is good in installation quality and does not seep water, the water pressure in the cavity cannot be reduced; otherwise, if the water pressure in the closed cavity is reduced, the water seepage part exists, the water seepage point is found out and treated in time, then water is pressurized again until the water tightness requirement is met, and the installation quality of the large OMEGA water stop of the pipe joint connector is detected through repeated water pressure tests, so that the good water tightness of the pipe joint connector is ensured.
In the embodiment, the water inlet hole and the exhaust hole are formed in the inner wall of the immersed tube, water is injected into the closed cavity formed between the GINA water stop and the large OMEGA water stop after the immersed tube is installed, the air is exhausted, the water in the closed cavity is kept at a certain pressure, and whether the water pressure in the closed cavity is reduced or not is continuously monitored, so that the condition whether water leakage exists in the two waterproof systems of the GINA water stop and the large OMEGA water stop at the immersed tube joint or not is known, the water leakage point is repeatedly tested until the water pressure is kept unchanged after being treated, the waterproof effect of the water stop at the joint after the immersed tube is installed in the open sea can be checked, the water tightness of the tube joint is ensured to be good, the loss caused by water leakage of the immersed tube joint is avoided, and the method has very important guiding significance for the engineering design and construction of similar immersed tube tunnels.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A method for detecting leakage of an underwater waterstop after an immersed tunnel is installed is characterized by comprising the following steps:
a. a water inlet hole and an exhaust hole are formed in the inner wall of the immersed tube, and the water inlet hole and the exhaust hole are communicated with a closed cavity formed between the GINA water stop and the large OMEGA water stop after the immersed tube is installed;
b. respectively injecting water and exhausting gas into the closed cavity through the water inlet hole and the exhaust hole, closing the exhaust hole after the gas is exhausted, and continuing injecting water until the water pressure reaches the external environment water pressure of the pipe joint connector, and stopping injecting water;
c. continuously monitoring whether the water pressure in the closed cavity drops within a period of time, and checking the condition of the water stop belt;
d. if the water pressure in the closed cavity is gradually reduced, searching a leakage point and repeating the steps b and c after treatment until the water pressure is kept unchanged;
e. and discharging all water in the closed cavity.
2. The method for detecting the leakage of the underwater waterstop after the immersed tunnel is installed according to claim 1, wherein in the step a, the water inlet hole and the exhaust hole are pipelines which are buried in the immersed tube when the immersed tube is prefabricated.
3. The method for detecting the leakage of the underwater waterstop after the immersed tunnel is installed according to claim 2, wherein the exhaust holes are formed in a top plate of an inner cavity of the immersed tunnel.
4. The method for detecting the leakage of the underwater waterstop after the immersed tunnel is installed according to claim 3, wherein the water inlet hole is formed in a bottom plate of an inner cavity of the immersed tunnel.
5. The method for detecting the leakage of the underwater waterstop after the immersed tunnel is installed according to claim 4, wherein the number of the water inlet holes is two.
6. The method for detecting the leakage of the underwater waterstop after the immersed tunnel is installed according to claim 5, wherein a protective cover for protecting a water inlet hole is arranged on a bottom plate of an inner cavity of the immersed tunnel.
7. The method for detecting the leakage of the underwater water stop after the immersed tunnel is installed according to claim 1, wherein in the step b, when water is injected into the closed cavity and air is exhausted, a water receiving container is required to be arranged at an exhaust hole.
8. The method for detecting the leakage of the underwater water stop after the immersed tunnel is installed according to claim 7, wherein when water is injected into the closed cavity for air exhaust, and when water is discharged from the air exhaust holes and is a continuous water column, the air exhaust holes can be closed.
9. The method for detecting the leakage of the underwater water stop after the immersed tunnel is installed according to claim 1, wherein in the step c, the change of the water pressure in the closed cavity needs to be continuously monitored for four hours.
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| CN201710776330.3A CN107489434B (en) | 2017-08-31 | 2017-08-31 | Method for detecting leakage of underwater waterstop after immersed tunnel installation |
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| CN201710776330.3A CN107489434B (en) | 2017-08-31 | 2017-08-31 | Method for detecting leakage of underwater waterstop after immersed tunnel installation |
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| CN111485581B (en) * | 2020-04-22 | 2021-06-11 | 中交第三航务工程局有限公司 | Method for treating water leakage of underwater cable-stayed suspension tunnel |
| CN113607342B (en) * | 2021-07-30 | 2024-05-03 | 中船黄埔文冲船舶有限公司 | Sealing inspection method for steel shell compartment of immersed tube tunnel |
| CN114960749A (en) * | 2022-06-21 | 2022-08-30 | 华设设计集团股份有限公司 | Underwater tunnel deformation joint built-in detachable water stop and real-time monitoring method |
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| JP3311965B2 (en) * | 1997-06-27 | 2002-08-05 | 首都高速道路公団 | Leakage water treatment method for tunnel expansion joints |
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